Linux Permissions Quiz: Can You Master Chmod, Chown & Umask?

1. In ls -l output, what does the first character represent?

File owner

File type (-, d, l, etc.)

Permission level

File size

2. What is the default umask value on most Linux systems?

0011

0022

0077

0002

3. Which command would remove all permissions from a file for everyone except the owner?

Chmod 700 filename

Chmod 600 filename

Chmod 400 filename

Chmod 000 filename

4. In chmod notation, what does 'a' represent?

All users (owner, group, other)

Administrator only

Anonymous users

Archive files

5. What does the SGID bit (2000) on a directory do?

New files inherit the directory's group

Only owner can execute files

Files are encrypted

Write permission is restricted

6. Which command displays the current umask value?

Umask -l

Umask

Show umask

Cat /etc/umask

7. What permissions are represented by octal 600?

Rw-r--r--

Rw-------

Rwxr-xr-x

R--r--r--

8. How do you change both owner and group with one chown command?

Chown user group filename

Chown user:group filename

Chown -u user -g group filename

Chmod user:group filename

9. What does the sticky bit (1000) do on a directory?

Only owner can delete files within it

All users can read files

Files are automatically compressed

Group ownership is inherited

10. Which octal value represents write permission?

1

2

4

7

11. What does the octal value 755 represent in chmod notation?

Owner: rwx, Group: r-x, Other: r-x

Owner: rwx, Group: rw-, Other: rw-

Owner: rw-, Group: r-x, Other: r-x

Owner: r-x, Group: rwx, Other: rwx

12. What does 'g-w' do in chmod?

Adds write permission for group

Removes write permission for group

Sets group permissions to write only

Displays group write status

13. Which permission value is required to enter a directory?

Read (4)

Write (2)

Execute (1)

All of the above

14. How would you recursively change all files in a directory to 755 permissions?

Chmod -r 755 /path/to/dir

Chmod -R 755 /path/to/dir

Chown -R 755 /path/to/dir

Chmod 755 /path/to/dir/*

15. What does the 's' special permission in the owner position indicate?

Sticky bit

Set-user-ID (SUID)

Set-group-ID (SGID)

Shared permission

16. Which octal digit represents read permission?

1

2

4

8

17. If umask is set to 0022, what permissions will a new file have?

644 (rw-r--r--)

755 (rwxr-xr-x)

777 (rwxrwxrwx)

600 (rw-------)

18. What is the purpose of the umask command?

Removes all permissions from files

Sets the default permission mask for newly created files

Changes ownership of existing files

Displays current file permissions

19. In symbolic notation, what does 'u+x' do?

Adds execute permission for owner only

Removes execute permission for all

Sets read permission for user

Adds execute permission for group

20. Which command changes the owner of a file to user 'admin' and group 'staff'?

Chmod admin:staff filename

Chown admin:staff filename

Chgrp admin filename

Chmod u=admin:g=staff filename

Linux Permissions Quiz: Can You Master chmod, chown & umask?